FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Cullen Michael T.
2. Issuer Name and Ticker or Trading Symbol

Sun BioPharma, Inc. [ SNBP ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    __X__ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Exec. Chairman, Pres. & CEO
(Last)          (First)          (Middle)

712 VISTA BLVD #305
3. Date of Earliest Transaction (MM/DD/YYYY)

5/22/2020
(Street)

WACONIA, MN 55387
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

5/27/2020 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 5/22/2020  P  10000 A (1)204576 (2)I By Cullen Living Trust Dated April 23, 2009 
Common Stock         197995 (2)D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) Reported securities purchased as one share of common stock and one warrant to purchase one share of common stock for a combined price of $4.00 per "unit."
(2) This report is amended solely to attribute the purchases of the shares and warrants to the reporting person's indirect holdings. The original report incorrectly attributed them to the reporting person's direct holdings.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Cullen Michael T.
712 VISTA BLVD #305
WACONIA, MN 55387
XXExec. Chairman, Pres. & CEO

Signatures
/s/ Joshua L. Colburn, Attorney-in-Fact9/1/2020
**Signature of Reporting PersonDate

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